Imaging lens and imaging apparatus

Patent metadata

Field	Value
Publication number	US-9201214-B2
Application number	US-201313887757-A
Country	US
Kind code	B2
Filing date	May 6, 2013
Priority date	Nov 15, 2010
Publication date	Dec 1, 2015
Grant date	Dec 1, 2015

Abstract

An imaging lens includes negative first lens having a concave image-side surface, positive second lens having a convex object-side surface in a paraxial region, an aperture stop, and positive third lens having a convex image-side surface in the paraxial region, which are arranged in this order from an object side. The Abbe numbers of materials constituting the first lens and the third lens for d-line are greater than or equal to 40. The Abbe number of a material constituting the second lens for d-line is less than or equal to 40. When the focal length of an entire system is f, and the center thickness of the second lens is D 3 , and the focal length of the first lens is f 1 , the following formulas (1′) and (2) are satisfied:

1.7< D 3/ f <2.9; and  (1′)

−5.0< f 1/ f <−1.8.  (2)

First claim

What is claimed is:

1. An imaging lens consisting of:
a negative first lens having a concave image-side surface;
a positive second lens having a convex object-side surface in a paraxial region;
an aperture stop; and
a positive third lens having a convex image-side surface in the paraxial region, which are arranged in this order from an object side,
wherein the Abbe numbers of materials constituting the first lens and the third lens for d-line are greater than or equal to 4…

Assignees

• Fujifilm Corp

Inventors

• Asami Taro
• Kondo Masato

Classifications

• G02B13/04 Primary

  Physics · mapped topic

• G02B13/0035

  Physics · mapped topic

• G02B13/0015 Primary

  Physics · mapped topic

• G02B13/06

  Physics · mapped topic